Timber Frame Flat Roof Construction Details

Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.

Timber frame flat roof construction details.

44 0 1483 769518 fax. Timber in the form of rough sawn or planedboards or planks can be used as the loadbearing deck to a flat roof fig. Thermal bridges occur at all junctions in the building as well as when penetrations of the thermal insulation envelope occur. Timber frame standard details september 09 building 1 grosvenor court hipley street old woking surrey tel.

On a basic level flat roof construction comes in the form of roofing timbers or joists as they are more commonly known or steels that are laid across two uprights walls in most cases. Thermal bridges can account for 35 50 of overall fabric. This will give additional stability to the roof structure. 3 05 timber frame pitched roof.

Very simple trusses work on a principle of thirds. Boardsmust have a nominal thickness of min. Timber framing in our time power tools have made the components for the timber frame easier to refine but the methods for joining and principles of construction are largely unchanged from the 1600 s here a timberwright lays out a knee brace to be inserted in a mortise cut in the column and beam to give the bent additional lateral stability. Ventilated batten void warm roof gable 3 06 timber frame timber flat roof 3 07 timber frame timber flat roof with parapet 3 08 timber frame lintel at window head 3 09 timber frame windows and doors jambs and cills specification within an example should 3 10 timber frame ground.

44 0 1483 770863 e mail. Depending on the design of the trusses you re making any number of bracing joints will be necessary. The roof sheathing consisted of inch thick wide pine boards nailed to the purlins and thick enough to resist much sagging. A super basic a frame roof will require anywhere between 4 and 8 depending on the size of the rafters with plumb cuts necessary for each angle in the brace.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Below is a sketch of the original roof wall structural details for this building. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. The construction of the flat roof is similar to that of the timber upper floor.

24 mm 20 and should have. The original roof was built using purlins beams extending between gable ends.